tests/spec/arb_draw_elements_base_vertex/drawelements.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  */
  26
  27 /** @file draw-elements-base-vertex.c
  28  * Tests ARB_draw_elements_base_vertex functionality by drawing a series of
  29  * pairs of quads using different base vertices, using the same vertex and
  30  * index buffers.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_width = 300;
  40         config.window_height = 300;
  41         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  42         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  43
  44 PIGLIT_GL_TEST_CONFIG_END
  45
  46 #define NUM_QUADS  10
  47
  48 static uintptr_t ib_offset;
  49
  50 void
  51 piglit_init(int argc, char **argv)
  52 {
  53         GLfloat *vb;
  54         GLuint *ib;
  55         GLuint vbo;
  56         GLboolean user_va = GL_FALSE;
  57         int i;
  58
  59         for (i = 1; i < argc; i++) {
  60                 if (!strcmp(argv[i], "user_varrays")) {
  61                         user_va = GL_TRUE;
  62                         puts("Testing user vertex arrays.");
  63                 }
  64         }
  65
  66         if (!user_va)
  67                 piglit_require_extension("GL_ARB_vertex_buffer_object");
  68         piglit_require_extension("GL_ARB_draw_elements_base_vertex");
  69
  70         glMatrixMode(GL_MODELVIEW);
  71         glPushMatrix();
  72         glLoadIdentity();
  73
  74         if (!user_va) {
  75                 glGenBuffersARB(1, &vbo);
  76                 glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
  77                 glBufferDataARB(GL_ARRAY_BUFFER_ARB,
  78                                 NUM_QUADS * 8 * sizeof(GLfloat) +
  79                                 2 * 4 * sizeof(GLuint),
  80                                 NULL, GL_DYNAMIC_DRAW);
  81                 vb = glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
  82         } else {
  83                 vb = malloc(NUM_QUADS * 8 * sizeof(GLfloat) +
  84                             2 * 4 * sizeof(GLuint));
  85         }
  86
  87         for (i = 0; i < NUM_QUADS; i++) {
  88                 float x1 = 10;
  89                 float y1 = 10 + i * 20;
  90                 float x2 = 20;
  91                 float y2 = 20 + i * 20;
  92
  93                 vb[i * 8 + 0] = x1; vb[i * 8 + 1] = y1;
  94                 vb[i * 8 + 2] = x2; vb[i * 8 + 3] = y1;
  95                 vb[i * 8 + 4] = x2; vb[i * 8 + 5] = y2;
  96                 vb[i * 8 + 6] = x1; vb[i * 8 + 7] = y2;
  97         }
  98         ib_offset = NUM_QUADS * 8 * sizeof(GLfloat);
  99         ib = (GLuint *)((char *)vb + ib_offset);
 100         for (i = 0; i < 8; i++)
 101                 ib[i] = i;
 102
 103         if (user_va) {
 104                 ib_offset = (uintptr_t)ib;
 105         } else {
 106                 glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
 107                 glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, vbo);
 108         }
 109
 110         glEnableClientState(GL_VERTEX_ARRAY);
 111         glVertexPointer(2, GL_FLOAT, 0, user_va ? vb : NULL);
 112 }
 113
 114 enum piglit_result
 115 piglit_display(void)
 116 {
 117         GLboolean pass = GL_TRUE;
 118         float white[3] = {1.0, 1.0, 1.0};
 119         float clear[3] = {0.0, 0.0, 0.0};
 120         int i, j;
 121
 122         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 123
 124         glColor3fv(white);
 125         /* Draw columns with each successive pair of the quads. */
 126         for (i = 0; i < NUM_QUADS - 1; i++) {
 127                 glMatrixMode(GL_PROJECTION);
 128                 glPushMatrix();
 129                 glLoadIdentity();
 130                 glOrtho(0, piglit_width, 0, piglit_height, -1, 1);
 131                 glTranslatef(i * 20, 0, 0);
 132
 133                 glDrawElementsBaseVertex(GL_QUADS, 8, GL_UNSIGNED_INT,
 134                                           (void *)(uintptr_t)ib_offset, i * 4);
 135
 136                 glPopMatrix();
 137         }
 138
 139         for (i = 0; i < NUM_QUADS - 1; i++) {
 140                 for (j = 0; j < NUM_QUADS; j++) {
 141                         float *expected;
 142
 143                         int x = 15 + i * 20;
 144                         int y = 15 + j * 20;
 145
 146                         if (j == i || j == i + 1)
 147                                 expected = white;
 148                         else
 149                                 expected = clear;
 150                         pass = piglit_probe_pixel_rgb(x, y, expected) && pass;
 151                 }
 152         }
 153
 154         piglit_present_results();
 155
 156         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 157 }